Some Properties of the Zinc Group Elements, Table

Some Properties of the Zinc Group Elements, Table

▪ Table
zinc cadmium mercury

Atomic number 30 48 80
Atomic weight 65.37 112.41 200.61
Melting point (degrees Celsius) 419.57 321 -38.8
Boiling point (degrees Celsius) 907 767 357
Density, solid (grams per cubic centimetre) 7.14 (20 degrees Celsius) 8.65 (20 degrees Celsius) 14.17 (-38.9 degrees Celsius)
Density, liquid (grams per cubic centimetre) 6.48 (500 degrees Celsius) 7.821 (500 degrees Celsius) 13.546 (20 degrees Celsius)
Valence 2 2 2, 1
Isotopic abundance zinc-64 (50.9), cadmium-106 (1.4), mercury-196 (0.15),
(terrestrial, percent) zinc-66 (27.3), cadmium-108 (1.0), mercury-198 (10.1),
zinc-67 (3.9), cadmium-110 (12.8), mercury-199 (17.0),
zinc-68 (17.4), cadmium-111 (13.0), mercury-200 (23.3),
zinc-70 (0.5) cadmium-112 (24.2), mercury-201 (13.2),
cadmium-113 (12.3), mercury-202 (29.5),
cadmium-114 (28.0), mercury-204 (6.7)
cadmium-116 (7.3)
Radioactive isotopes 60-63, 65, 103-105, 107, 109, 185-195, 197, 203,
(mass numbers) 69, 71, 72 115, 117-119, 121 205, 206
Heat of fusion (calories per gram) 24.1 13.2 2.82
Heat of vaporization (calories per gram) 426 240 70.6
Specific heat 0.092 0.055 0.033
(calories per gram per degree Celsius
at 20 degrees Celsius)
Electrical resistivity 5.75 7.6 95.8
at 20 degrees Celsius (microohm-centimetre)
Hardness (Brinell number) 38.1 29.0 —
Crystal structure hexagonal, hexagonal, rhombohedral
close-packed close-packed
Radius
Metallic (angstroms) 1.332 1.489 1.500
Ionic (+2 ion, angstroms) 0.75 0.99 1.12
Ionization energy
First 9.36 8.96 10.2
Second 17.89 16.84 18.65
Third 40.0 38.0 —
Electronegativity 1.6 1.7 1.9

* * *


Universalium. 2010.

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